Missing boy's beanie found in Vic bushland

A beanie belonging to Luke Shambrook has been found, but there is still no sign of the autistic boy missing in a Victorian national park for four days.

The beanie was found in bushland to the west of, and not far from, Candlebark campsite where the 11-year-old was last seen on Good Friday.

The discovery on Monday gave searchers another piece of the puzzle - the direction Luke had wandered off - though it is not known when the beanie was dropped.

There were heightened hopes Luke would be found on Monday, after a family on a 4WD trip reported sighting a boy in rugged bushland in the Devils River area late on Sunday.

A search of this area through Sunday night and Monday found no sign of Luke.

Campers and about 40 volunteers from nearby towns are helping rescue teams - including the air wing, dog squad, local police and SES volunteers - in an ongoing search of Fraser National Park and surrounds.

"We continue to express our thanks to all involved in searching for Luke," the Shambrook family said in a statement on Monday afternoon.